I think that maybe you feel a bit more 'cheated' because it was something you didn't know about and the face to face reaction wasn't the ideal.
I don't agree that looking at porn makes a man more likely to cheat at all. I think it probably gives enough people an outlet that probably halves the number of men cheating on their wives to be honest.
The vast majority of men are visually stimulated. Women are mentally stimulated - this is scientific fact. This is why the shades of grey books sold so many copies. Do you think if you read those books that your OH would think you were cheating?
Twitter is full of internet trolls. I get about 6 of those 'naked women' follow me every week asking me if I want to spank them etc. I just hit the block button, many people probably follow back.
I don't think for 1 second that he believes anything that is written or posted on twitter by these 'women'. He will know that they are probably 50 yr old spinsters earning some extra cash or even 17 year old boys competing to find out how many follows they can get. It doesn't mean anything at all.
I think that women would be surprised at how many 'normal' family men look at porn on the internet. I bet at least half of the people out there that swear blind their other halves don't do it are actually living with the top 3% of porn site visitors. It's not something we can get away from and a lot of women wouldn't want to.
I'm not saying that I don't have a pang of jealousy when my husband has obviously been looking online at such things, but I know that having been together for 15 years and neither of us cheating and both of us being honest and open about our likes and dislikes, porn has (whether I like it or not) played a part in keeping us together.
We are naive to think that 2 people can 100% satisfy each other forever. Fantasy and sharing that fantasy are a very important part of a relationship.
I would suggest talking to him about why he needs to do it, but being careful not to make him embarrassed and feel like a little boy as he will just close down, then say how it makes you feel. Tell him that it's the lies that upset you and if you feel the need to ask him and be reassured by him, you would love it if he could just be honest with you.
You need to find a level at which you are comfortable with this, some people won't tolerate it at all, everyone is different.
For me, I let him get on with it, when we were ttc, he said he wouldn't do anything like that around Ov time and waste his spermies and then sometimes I would watch it with him - once he's watched it with you and you both enjoy it together, he will find it easier to be honest and open and maybe even think of you when he's at it! But, you have to agree between you what you are comfy with - just try not to have an unrealistic or unreasonable reaction. If you feel that it's wrong, then that's fine, but don't berate him for something if he wasn't sure about where the boundaries were in the first place.
But for the record. Following naked women on twitter - not cheating. Meeting up with the naked women on twitter - bad behaviour, harsh words said, possibly end of relationship. Shagging the naked women on twitter - cheating resulting in decapitation or loss of manhood and divorce.
and
If my husband caught me looking at porn or following hot men on twitter - he'd be turned on and not upset at all.